The Solid black (with white) puppy I saw in person had a very glossy, shiny coat- like a beautiful pitbull. That of course, isn't the correct coat for a presa, even a puppy. Didn't see this dog grown, so have no clue as to health or temp. As for puppy temp, it was a normal puppy.. there have been some debates over the black coat. The official verdict on the black coat as told to us by the Spanish club was that the black coated dogs were unhealthier; however, not having too many specimens available to us here in the US, and those that do have them would probably go to their grave before revealing any flaws.. I can't substantiate the spanish reasoning. As for the all/predominantly white dogs.. haven't seen too many of those lately. They were more visible in the early to mid 90's here in the US. Met one majorly used stud dog named BullRog....who looked like a bulldog. ALl white with brindle patching, and a nasty attitude. Passed that and several other strange colors, as well as the large white amounts on to his progeny. Show Stoppers has produced 2 all white presas that I know of. They were living in Detroit last I heard, and were descended/heavily inbred from Medusa, a primarily white foundation bitch. So seems the flash can take over such as n boxers, but since the goal of ALL presa standards is less white...you don't see them as often as in the boxer breed.